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912.3 Size.
The dry vent serving the wet vent shall be sized based on the largest required diameter of pipe within the wet-vent system served by the dry vent. The wet vent shall be of a size not less than that specified in Table 912.3, based on the fixture unit discharge to the wet vent.
Table 912.3
Wet Vent Size
 
Minimum Wet Vent Pipe Size
(inches)
Maximum Drainage Fixture Unit Load
(dfu)
2
4
2 1/2
6
3
12
 
For SI: 1 inch = 25.4 mm.
Section PC 913: Reserved
Section PC 914: Circuit Venting
914.1 Circuit vent permitted.
A maximum of eight fixtures connected to a horizontal branch drain shall be permitted to be circuit vented. Each fixture drain shall connect horizontally to the horizontal branch being circuit vented. The horizontal branch drain shall be classified as a vent from the most downstream fixture drain connection to the most upstream fixture drain connection to the horizontal branch.

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